Coltsfoot and Lesser Celandine. Depending on your source of information they are either good tortoise food or toxic, so decide for yourself.
My tortoises eat both, but Lesser Celandine only before it starts to bloom.
For humans/mammals the young leaves are edible in small quantities, but it becomes more toxic when the flowers appear. As far as I know, it's unproven if or how toxic it is for tortoises.Is the Lesser Celandine (bloom) really that bad?